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Noise Design Engineering of a Large Industrial Plant A Case Study

IP.com Disclosure Number: IPCOM000217555D
Publication Date: 2012-May-08
Document File: 7 page(s) / 539K

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The IP.com Prior Art Database

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Page 01 of 7

Noise Design Engineering of a Large Industrial Plant A Case Study

Abstract

A number of petrochemical plants have been constructed in Norway over the past 20 years. These plants are complex in design, consisting of many pieces of noise generating equipment linked by piping systems that total many kilometres in length.

Such plants require careful design with regard to noise to ensure that they fulfil the requirements for neighbourhood noise, as well as for the working environment. A regulatory night time limit of 40dBA at the nearest dwelling is often the governing factor in Noise Control Design.

Modificationsand extensions to existing plants can provide special problems as the plant may already be operating at the permittednoise limit.

This paper gives details of work undertaken during the design and construction of a large extension to an existing facility in Norway. It presents the results of significant testing work undertaken during this project, with particular attention being paid to both the source and attenuation of piping noise.


1. Introduction

M.W. Kellogg Ltd. recently completed construction of a large gas processing plant in Norway. This was a world scale, two process-train expansion to an existing facility which processes gas for export to continental Europe.

Each process train consists of two turbo expander re-compressor units, a de-ethaniser compressor, a gas turbine driven sales gas export compressor, refrigeration compressors, many pumps for moving the various liquefied gas products around the plant, many columns, vessefs, heat exchangers, and many kilometresof piping.

The plant itself covers an area of approximately 4 km2.

The facility was required to meet a number of special environmentalperformance limits, to meet Norwegian Legislative requirements, which are among the most stringent in the world.

The operating licence for the plant required a maximum night-time sound pressure level of 42 dB(A) at the faeade of the nearest residential property, which in this case was approximately 800m away. This was an easement of the "standard" legislation that requires 40 dB(A) because the existing facility already produced 42 dB(A). The expansion project was therefore not allowed to increase the existing plant operating levels despite a near doubling of the plant's capacity.

To achieve this a "guaranteed" maximum sound power level for the expansion project was set requiring a contribution of noise 10 dB(A) below the level of the existing facility to be achieved at the closest residential property. The design sound power level limit for the project was therefore set at 106 dB(A).

To ensure that this limit was met, careful control of the acoustic design was maintained during both the design and construction phases of the project.

Jon Richards

M.W.Kellogg Ltd.

Greenford,
Middlesex. UK



Page 02 of 7


2. Initial Plant Noise Design Basis

    Category Project Design Basis

Compressor Houses


Gas Turbines -Parts external to compressor house...